Best place is a lumber yard that carries many hardwoods and exotics. They are some times hard to find. Other sources forIpe (brazilian walnut),red oak, and osage (some times), are lowes or home depot. The Ipe will be sold as a decking material. You can also get bamboo at flooring stores, just make sure your bamboo is side pressed or itwont work. Plain pressed or horizontal pressed will not work.You can also get oak at Lowes or Home depot.. You can order online from several different sources. Ebay, online lumber yards, ect. ect. The only problem with online is the cost of shipping. If you buy lots of wood like I, it is much cheaper to pick it up some where instead of haveing it shipped. One other thing about online sources, its hard to see what grain you are getting. Which is very crutial in your wood choice.